WO2005008861A1 - Aimant torique - Google Patents

Aimant torique Download PDF

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Publication number
WO2005008861A1
WO2005008861A1 PCT/DE2004/001026 DE2004001026W WO2005008861A1 WO 2005008861 A1 WO2005008861 A1 WO 2005008861A1 DE 2004001026 W DE2004001026 W DE 2004001026W WO 2005008861 A1 WO2005008861 A1 WO 2005008861A1
Authority
WO
WIPO (PCT)
Prior art keywords
ring magnet
ring
magnet
teeth
axial
Prior art date
Application number
PCT/DE2004/001026
Other languages
German (de)
English (en)
Inventor
Andreas Wehrle
Gerd Walter
Original Assignee
Robert Bosch Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Publication of WO2005008861A1 publication Critical patent/WO2005008861A1/fr

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • H02K1/2706—Inner rotors
    • H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
    • H02K1/2726—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of a single magnet or two or more axially juxtaposed single magnets
    • H02K1/2733—Annular magnets

Definitions

  • electrical machines are used for a wide variety of applications, including for moving moving parts.
  • permanently magnetically excited direct current motors which can be commutated electronically and mechanically.
  • two embodiments can be distinguished, namely a first, in which the permanent magnet is arranged on the stator, and a second, in which the permanent magnet is attached to the rotor.
  • the commutated movable magnetic field between the permanent magnets and the coils arranged on the other component causes the torque to be transmitted to the rotor shaft.
  • EP-0 872 945 AI shows, for example, an electrical machine in which two ring magnets are glued to a rotor body of the armature shaft as a permanent magnet.
  • a ring magnet with a very high magnetic field concentration it is made from a sintered material, for example containing rare earth elements. In terms of production technology, such a ring magnet can only be produced with a limited axial length and with a predetermined diameter.
  • two such ring magnets are arranged axially next to one another and firmly glued to the rotor body. Due to the different temperature expansion of the different materials of magnet, adhesive and rotor body / shaft, as well as due to manufacturing tolerances and due to the necessary distance between the ring magnets when using an adhesive _ -
  • the ring magnet according to the invention with the feature of claim 1 has the advantage over the fact that by forming an axial structure on the end faces of the ring magnet, the ring magnet can be positively connected to or attached to it without the need to use adhesive. This allows use even at high operating temperatures, with no breaks occurring between different magnet segments or between the ring magnets and a bearing body receiving them, even when the material expansions differ greatly.
  • a plurality of ring magnets can also be arranged precisely in a defined rotational position relative to one another, so that the pole regions, which change over the circumference, can be aligned exactly with one another without adjustment effort.
  • the axial form-fit engages in corresponding axial counter-form of a further ring magnet segment or a holding element of the ring magnet.
  • Any number of identically designed ring magnets can advantageously be arranged axially next to one another. If the last ring magnet segment also has such an axial structure at its terminating end, this can cooperate in a form-fitting manner with a corresponding axial structure of a holding device which, for example, applies an axial force to both ends of the ring magnets which are lined up in a row, which both the individual ring magnet segments are rotationally fixed to one another connects when this is also fixed, for example, on a rotor shaft.
  • Such an axial structure can advantageously be produced as a regular circumferential axial toothing, the tooth shape being, for example, triangular, rectangular, trapezoidal or shaped according to any curve shape. If the teeth of one ring magnet engage in the corresponding tooth gaps of the other ring magnet, practically no shear forces occur between the two magnets, but only compressive forces, which significantly reduces the mechanical load on the ring magnets.
  • the magnetic pole areas on the ring magnets by means of a magnetizing tool, it is particularly simple in terms of production technology to arrange the pole areas in such a way that their separating lines run approximately parallel to the axis of the ring magnets.
  • the rotational position of the axial teeth is advantageously arranged in such a way that, for example, one tooth in each ring magnet is always arranged with a dividing line of the pole regions with respect to the circumferential direction.
  • the dividing lines of the different ring magnet segments can always be clearly arranged with respect to one another, for example that the dividing lines of the individual ring magnets lie on one line.
  • the pole regions of the different segments can also be rotated relative to one another by a fraction of a pole region, for example in order to produce a permanent magnet with a twist, which in particular means Torque ripple or the cogging torque is reduced.
  • the toothing on the two star sides is arranged in such a way that the arrangement of the pole areas remains identical even when the ring magnets are installed in the opposite direction (rotation about an axis perpendicular to the cylinder axis) , Due to the amount of shrinkage during sintering, each tooth is always formed axially opposite a tooth gap, so that the ring magnet does not deform unevenly when it cools down.
  • connection of individual ring magnet segments by means of such an axial structure is particularly suitable for the use of magnets made of sintered materials, since these are manufactured as hollow cylinder magnets with respect to a specific one Diameter can only be produced with a limited axial length.
  • a permanent magnet of corresponding length can be assembled from any number of identical segments in accordance with the desired requirement. This reduces the variety of parts, which reduces storage and assembly costs for the manufacture of an electrical machine.
  • the ring magnet segments at the open edge of the permanent magnet can also be formed identically to the central ring magnet segments.
  • the toothing between the axial clamping element and the ring magnet brings about a torsion-proof connection between the individual segments and between the permanent magnet and, for example, the rotor, as a result of which high torques can be transmitted.
  • the axial clamping elements can advantageously be designed such that they elastically compensate for axial and radial fluctuations in the material expansion due to the temperature differences or manufacturing tolerances.
  • both permanent magnets with separating lines lying axially on a straight line as well as permanent magnets with pole areas rotated in sections relative to one another can be realized by means of a single type of ring magnet, for example to reduce the torque ripple and / or to influence the cogging torque accordingly.
  • FIG. 1 shows a schematic view of a ring magnet
  • FIG. 2 shows a sectional view according to II-II of the ring magnet shown in FIG. 1,
  • FIG. 3 shows the joining of three individual ring magnet segments to form a permanent magnet
  • Figure 4 shows another embodiment of a permanent magnet mounted on a rotor shaft
  • Figure 5 is a sectional view of a stator with a further embodiment of a permanent magnet.
  • FIG. 1 and 2 show a ring magnet 10 which is essentially designed as a hollow cylinder 12.
  • the ring magnet 10 is made of highly magnetizable material - for example rare earth connections - which is shaped into a ring magnet 10 by means of sintering.
  • the ring magnet 10 has on its two end faces 14, 16 an axial structure 20 which engages in corresponding counter-shapes 21 of a further ring magnet 10 or of holding elements 18.
  • a shepherd's toothing 26 is formed on each of the side surfaces 14, 16 as an axial structure 20, in which essentially triangular teeth 22 are alternately arranged with tooth gaps 24 evenly over the entire circumference of the hollow cylinder 12. If the teeth 22 are inserted axially into corresponding tooth gaps 24 of a further ring magnet 10, the flanks 28 of the teeth 22 form a positive fit with the corresponding flanks 30 of the corresponding tooth gap 24.
  • torque is transmitted between a movable magnetic field of a stator 32 and that on an armature shaft 34 arranged ring magnet 10, the torque between the individual ring magnet segments 10 via the flanks 28, 30 of the teeth 22 and tooth gaps 24 transmitted.
  • the pole regions 36 are magnetized radially, for example, so that the individual pole regions 36 are magnetically connected to one another via a yoke element, for example the armature shaft 34 or a housing 33.
  • a yoke element for example the armature shaft 34 or a housing 33.
  • tangential magnetization is also possible, in which no magnetic yoke element is necessary.
  • the dividing lines 38 between the pole regions 36 in the exemplary embodiment extend approximately parallel to the axis 40 of the ring magnet 10 and are more or less sharply defined. In FIG.
  • a pole region 36 (for example north pole N) extends over an angular region 42 as a fraction of a full circumference.
  • a further pole region 36 (for example a south pole S in each case) then connects clockwise and counterclockwise, so that in this exemplary embodiment 6 pole pairs (N + S) are arranged over the entire circumference.
  • the number of pole pairs is 3, 5, 7, ... with the corresponding angular ranges 42 of 360 6, 360 10, 360714 ....
  • a tooth 22 or a tooth gap 24 is assigned to each pole region 36, so that when two ring magnets 10 are joined axially, the dividing lines 38 are always arranged on a line.
  • FIG. 3 This is shown in FIG. 3, where three ring magnets 10 are axially joined to form a permanent magnet 11.
  • Two teeth 22 or tooth gaps 24 are arranged in the angular area 42 of the pole area 36, each of which engages in a corresponding axial structure 21 of the corresponding axial end face 16, 14 of the other ring magnet 10.
  • the teeth 22 and tooth gaps 24 in each pole region 36 are formed in such a way that they are mirror-symmetrical to an axis of rotation. 44 are perpendicular to the axis 40, with the rotation of 180 ° resulting in the identical arrangement of the pole regions 36. As a result, it is not necessary to pay attention to their installation direction when assembling the ring magnets 10.
  • the pole regions 36 of the respective ring magnets 10 can be rotated relative to one another in this embodiment, so that the resulting permanent magnet 11 has a swirl 46 of the pole regions 36 ,
  • the ring magnets 10 on the edge of the permanent magnet 11 each have an end side 48, for example a smooth axial surface 50 with which the permanent magnet 11 is axially braced and / or fastened, for example, to a rotor shaft 34.
  • all ring magnets 10, here for example two, are of completely identical design, so that no second type of ring magnet 10 with flat axial surfaces 50 is necessary on the end sides 48 of the permanent magnet 11. Rather, holding elements 18 are arranged on the armature shaft 34, which have an axial structure 21 corresponding to the axial structure 20.
  • the axial structure 20 is formed by a rectangular toothing 51, which is trapezoidal in an alternative embodiment.
  • FIG. 5 shows a stator 32 which is designed as a pole housing 33 of an electrical machine and has a plurality of ring magnets 10, for example four, which are axially joined to one another as a permanent magnet 11.
  • a rotor 34 can be inserted within the permanent magnet 11 designed as a hollow cylinder 12, the coils of which generate a rotating magnetic field, due to its interactions with the permanent magnet 11, the rotor 34 rotates Teeth 22 or tooth gaps 24 are arranged and each ring magnet 10 is rotated by one tooth 22 and inserted into a corresponding tooth gap 24 of the adjacent ring magnet.
  • a total pole area 36 ′ is created with respect to the permanent magnet 11, which is arranged in a first approximation spirally on the hollow cylinder 12.
  • a swirl 46 of the pole region 36 ' can also be achieved in the overall result of the ring magnet 11.
  • the two ring magnets 10 with the end faces 48 of the permanent magnet 11 here again have axial surfaces 50 which are suitable for fastening with the axial clamping elements 52 for fastening the permanent magnet 11 in the housing 33.
  • the two ring magnets 10 can each have a cone or the like on the end sides 48 in the interior of the hollow cylinder 12, which cooperates with a corresponding shape of the holding elements 18.
  • the regions 36 are preferably already produced with a corresponding pre-orientation of the microscopic magnetic dipoles.
  • the final magnetization of the permanent magnet 11 can then be carried out either before or after the assembly of the individual ring magnets 10.
  • a tooth 22 is preferably arranged axially opposite a tooth gap on the first end face 14 of the hollow cylinder on the second end face 16. Due to the shape of the toothing mirror-symmetrical to the axis 44, the arrangement of the pole regions 36 remains unchanged regardless of the direction of installation of the ring magnets 10.
  • a preferred application of the ring magnet 10 according to the invention is the torque transmission of an electrical machine, but is not restricted to such.
  • the ring magnet 10 according to the invention can be mounted in many ways on a shaft 34 or in a housing 33. It is essential that the axial structure 20 interacts with a corresponding corresponding axial structure 21 of the other ring magnets 10 or the holding elements 18 by means of axial clamping forces. There is no need for adhesives. However, a filler can also be inserted between the teeth 20, 21, 26, 51, which ensures a uniform force distribution over the tooth flanks 28, 30. Such a filler can be adapted to the desired temperature range since it does not have to have an adhesive effect.
  • the arrangement of the magnetic pole regions 36 can be adapted as desired to the required application, as can the orientation of the magnetization (axial, radial, tangential, circular) with the dividing lines 38.
  • the configuration of the axial structure 20, 21 can also be varied as desired, the structure 20 not being uniform toothing arranged over the circumference is limited.
  • the end face 14, 16 can also be designed as axially corrugated toothing, the flanks preferably being oriented approximately perpendicular to the outer surface of the hollow cylinder 12.
  • the invention also comprises individual features of the exemplary embodiments or any combination of the features of different exemplary embodiments.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)

Abstract

L'invention concerne un aimant torique (10) conçu en particulier pour transmettre un couple de rotation entre un stator (32) et un rotor (34). Cet aimant torique (10) est configuré sensiblement sous la forme d'un cylindre creux (12) comportant deux faces (14, 16), et comprend des zones (36) de pôle magnétique différent sur sa circonférence. En outre, l'aimant torique (10) selon l'invention comporte une structure axiale (20, 21, 22, 24, 26) sur au moins une de ses faces (14, 16).
PCT/DE2004/001026 2003-07-15 2004-05-15 Aimant torique WO2005008861A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10331960.3 2003-07-15
DE2003131960 DE10331960A1 (de) 2003-07-15 2003-07-15 Ringmagnet

Publications (1)

Publication Number Publication Date
WO2005008861A1 true WO2005008861A1 (fr) 2005-01-27

Family

ID=33560104

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2004/001026 WO2005008861A1 (fr) 2003-07-15 2004-05-15 Aimant torique

Country Status (2)

Country Link
DE (1) DE10331960A1 (fr)
WO (1) WO2005008861A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7441573B2 (en) 2004-12-09 2008-10-28 The Goodyear Tire & Rubber Company Pneumatic tire having a rubber component containing short untwisted cord
WO2009144158A1 (fr) * 2008-05-29 2009-12-03 Robert Bosch Gmbh Kit de montage pour aimants polaires, aimant polaire et machine électrique
US8772993B2 (en) 2007-10-31 2014-07-08 Ebm-Papst St. Georgen Gmbh & Co. Kg Electric motor with adhesively bonded ring magnet
US9663780B2 (en) 2014-10-15 2017-05-30 Alpaqua Engineering, LLC Solid-core ring-magnet
US11242519B2 (en) 2018-08-23 2022-02-08 Alpaqua Engineering, LLC Discontinuous wall hollow core magnet

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1009827A (en) * 1963-10-09 1965-11-10 Sanyo Electric Co Dynamo-electric machine ferrite core rotors
JPS5921267A (ja) * 1982-07-28 1984-02-03 Dai Ichi Seiko Co Ltd 電磁モ−タ用ロ−タ
WO1995004398A1 (fr) * 1993-07-30 1995-02-09 Siemens Aktiengesellschaft Entrainement par moteur electrique
US20020135252A1 (en) * 2001-03-20 2002-09-26 Emerson Electric Co. Permanent magnet rotor design

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1009827A (en) * 1963-10-09 1965-11-10 Sanyo Electric Co Dynamo-electric machine ferrite core rotors
JPS5921267A (ja) * 1982-07-28 1984-02-03 Dai Ichi Seiko Co Ltd 電磁モ−タ用ロ−タ
WO1995004398A1 (fr) * 1993-07-30 1995-02-09 Siemens Aktiengesellschaft Entrainement par moteur electrique
US20020135252A1 (en) * 2001-03-20 2002-09-26 Emerson Electric Co. Permanent magnet rotor design

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 0081, no. 07 (E - 245) 19 May 1984 (1984-05-19) *
PATENT ABSTRACTS OF JAPAN vol. 0161, no. 78 (E - 1196) 28 April 1992 (1992-04-28) *

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7441573B2 (en) 2004-12-09 2008-10-28 The Goodyear Tire & Rubber Company Pneumatic tire having a rubber component containing short untwisted cord
US8772993B2 (en) 2007-10-31 2014-07-08 Ebm-Papst St. Georgen Gmbh & Co. Kg Electric motor with adhesively bonded ring magnet
WO2009144158A1 (fr) * 2008-05-29 2009-12-03 Robert Bosch Gmbh Kit de montage pour aimants polaires, aimant polaire et machine électrique
US9663780B2 (en) 2014-10-15 2017-05-30 Alpaqua Engineering, LLC Solid-core ring-magnet
US10087438B2 (en) 2014-10-15 2018-10-02 Alpaqua Engineering, LLC Solid-core ring-magnet
US10208303B2 (en) 2014-10-15 2019-02-19 Alpaqua Engineering, LLC Solid-core ring-magnet
US11400460B2 (en) 2014-10-15 2022-08-02 Alpaqua Engineering, LLC Solid-core magnet
US11242519B2 (en) 2018-08-23 2022-02-08 Alpaqua Engineering, LLC Discontinuous wall hollow core magnet

Also Published As

Publication number Publication date
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